rare

Description

Displays the least common values of a field.

Finds the least frequent tuple of values of all fields in the field list. If the <by-clause> is specified, this command returns rare tuples of values for each distinct tuple of values of the group-by fields.

This command operates identically to the top command, except that the rare command finds the least frequent instead of the most frequent.

Optional arguments

Description: Options that specify the type and number of values to display. These are the same <top-options> used by the top command.

<by-clause>

Syntax: BY <field-list>

Description: The name of one or more fields to group by.

Top options

countfield

Syntax: countfield=<string>

Description: The name of a new field to write the value of count into.

Default: "count"

limit

Syntax: limit=<int>

Description: Specifies how many tuples to return. If you specify limit=0, all values up to maxresultrows are returned. See Limits section. Specifying a value larger than maxresultrows produces an error.

Default: 10

percentfield

Syntax: percentfield=<string>

Description: Name of a new field to write the value of percentage.

Default: "percent"

showcount

Syntax: showcount=<bool>

Description: Specify whether to create a field called "count" (see "countfield" option) with the count of that tuple.

Default: true

showperc

Syntax: showperc=<bool>

Description: Specify whether to create a field called "percent" (see "percentfield" option) with the relative prevalence of that tuple.

Default: true

Usage

The number of results returned by the rare command is controlled by the limit argument. The default value for the limit argument is 10. You can change this limit up to the maximum value specified in the maxresultrows setting in the [rare] stanza in the limits.conf file. The default maximum is 50,000, which effectively keeps a ceiling on the memory that the rare command uses.

Examples

1. Return the least common values in a field

Return the least common values in the "url" field. Limits the number of values returned to 5.

... | rare url limit=5

2. Return the least common values organized by host

Find the least common values in the "user" field for each "host" value. By default, a maximum of 10 results are returned.

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